The theory behind the spell is that the magical link works both ways (remember that whilst the witch was using her influence to corrupt you, she herself was inherently corrupt).
Another variation on the theme is the bury the bottle under your doorstep, but this is more a preventative measure. The theory is that if the witch is using your genetic material to hex you, the first bit of you that the spell will encounter when it tries to get to you is the genetic material in your piss that is buried under your doorstep, and it therefore "earths" itself in that, rather than in you yourself.
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"If thou thyself hast not a sure foundation, whereon wilt thou stand to direct the forces of Nature?" Liber Librae, AC
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